Question about Texas Instruments TI-84 Plus Calculator

# Graphing sine is there any way to graph the function y=1/2 cos x

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Y=(1/2)*cos(x)

Posted on Apr 02, 2013

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• Texas Instru... Master

Sure.

Press Y=. Type in ( 1 / 2 ) * cos( X ) ENTER
Press GRAPH to see the graph.

If the graph isn't too clear, press WINDOW and change Ymin to -2 and Ymax to 2, then press GRAPH again.

Note: for -2, be sure to use the (-) key next to the decimal point instead of the - between the multiply and the add.

Posted on Feb 19, 2010

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## Related Questions:

### Ti-Nspire gives me coordinates in radians when my mode is set to degrees.

That is a round-about way to solve cos(x)=0.543 by graphing. Use the inverse function of the cosine arccos or cos^-1
If cos(x)=0.543 then x=arccos(0.543)
To graph a trigonometric function it is more natural to use the radian as the unit. However in geometry it is more common to use the degree. To solve an equation like x=arccos(0.543) where you want the answer to be degree, change the document settings to make the default angle unit the degree.

Make the graphing angle unit the degree and set that as default by selecting Make Default and press Enter.

Dec 15, 2013 | Texas Instruments TI-Nspire CX Graphing...

### X= disappeared from the Y=

You have several types of graphs
Function graphs
Y_1=f(x), Y1=3X^2-4, [X, T, Theta, n] key types X
Polar graphs r=F(theta), r=r_o*ln(theta). [X, T, Theta, n] types Theta
Parametric graphs X_1=f(T) and Y_1=g(T). [X.T, Theta, n] types T
Examples: X_1= cos(T). Y_1= 2(1--sin(T))
Sequence graphs u_n+1= f(u_n), [X,T,Theta,n] types n

Nov 21, 2013 | Texas Instruments TI-84 Plus Calculator

### X= disappeared

You have several types of graphs
Function graphs
Y_1=f(x), Y1=3X^2-4, [X, T, Theta, n] key types X
Polar graphs r=F(theta), r=r_o*ln(theta). [X, T, Theta, n] types Theta
Parametric graphs X_1=f(T) and Y_1=g(T). [X.T, Theta, n] types T
Examples: X_1= cos(T). Y_1= 2(1--sin(T))
Sequence graphs u_n+1= f(u_n), [X,T,Theta,n] types n

Nov 21, 2013 | Texas Instruments TI-84 Plus Silver...

### Sine graph is straight

If the angle unit is set to degrees and you use the standard window dimensions (Xmin=-10, Xmax=10) then all you will see is a straight line: Between 0 and 10 degrees, the sine is approximately equal to 0 and the cosine is about 1.

To see the features of the trigonometric functions you must do one of the following
1. Set angle to degree but set window dimensions to span the domain -180 to 180 or larger.
2. Set windows dimensions to the standard -10, 10 range but set angle degree to radians

May 12, 2012 | Texas Instruments TI-84 Plus Calculator

### Will not graph sin/cos/tan properly

Make sure you have the angular mode set to radians. In degree, the graph of sine(x) is nearly a straight line for small values of x.

May 08, 2012 | Texas Instruments TI-Nspire CAS Graphing...

### Im trying to graph a parametric equation and whenever the equation has an exponent/power in it the calculator says Syn error so i know how to graph x=2 cos T, y=2 sin T and similar equations without a...

To enter powers of trigonometric functions you must enclose the functions in parentheses and then apply the exponent to the whole. For example X1t =(sin T)^3 , Y1t=(cos T)^3 will give you a shape similar to a rhombus with concave sides. The symbol ^syands for the operation of raising to a power. The key is the one with the caret symbol ^ , and it is wedged between the xsqure and EXIT keys (third row of keys).
As regards the cotangent, use the equivalent definition cot(X)=1/tan(X).

Jul 26, 2011 | Casio FX-9750GPlus Calculator

### I cant get my graphs to plot right on my graph mode!! when I plot the sinX curve, I get a linear line that looks a lot like y=x and when I plot my cosX curve, I get y=1 HELPPP!

I believe it has to do with your angle unit. If you angle unit is set to degree and your default window dimensions are -10, 10, then the sine function will look like y=x ( straight line) and y=cos(X) is approximately 1 in that domain.
Your solution is one of the following.
Use degree as angle unit, but change the window dimensions for x to -180 to 180 and the y-dimensions to the interval -1 to 1.
Use the radian angle unit and leave the Xmin-Xmax interval -10 to 10.

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### How do you graph y = the inverse contangent of x?

The cotangent function is not implemented on the TI84PLUS native OS and consequently you will not find its inverse function on the calculator. However, there exits an equivalence (definition) between arc cotangent(x) and arc tangent (1/x).
Thus cot^(-1)(X)= tan^(-1)(1/X),

Be careful. Since it is a multivariate function, some authors define the principal branch in the domain [0, PI], while others define the domain on [-Pi/2, Pi/2]. You will have to consult your textbook, or the documents you are using to find out the domain of the principal branch.

Apr 12, 2010 | Texas Instruments TI-84 Plus Calculator

### Two graphs at the same time

Hello,
Here is one particulat gase where two graphs are executed simultaneously, yet you see one, but bo the other. When graphs are being executed the one for tan(x) is displayed as a bubble that outlines the variation of the tangente. But at the end, it evaporates, leaving only the sine function.

Here is the result.

Hope it helps.

Jul 08, 2009 | Texas Instruments TI-83 Plus Calculator

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